Just a random idea I had while playing Firefight in Reach (I know I’m off to a bad start, but humor me). And yes, I know that Halo 4 has already gone Gold, but still, maybe it could be DLC or something.
Basically, my idea is this: a Skull that can only be found of Legendary, on maybe the first mission, just before escaping to Requiem. here is a golden skull (or maybe a Mark VI helmet? Or a Monitor?) hidden somewhere. Obtaining it and completing the level with it would allow the inclusion of custom options in Campaign, including, but not limited to:
-Infinite Ammo/Bottomless Clip
-Friends’ SPARTAN-IVs appearing as AI in the Campaign in place of default S-IVs
-Personal S-IV in place of the Master Chief
-Shield Strength
-Master Chief in Halo 3/Halo: Anniversary-era armor
-Master Chief in red/blue/black/other-colored armor
-Female Chief (maybe with Tex’s voice?)
-Male Cortana (maybe Delta or Sigma?)
Thoughts, opinions, suggestions?